Commit 7194988f authored by Chris Metcalf's avatar Chris Metcalf
Browse files

arch/tile: disable SD_WAKE_AFFINE flag on CPU/NODE scheduling domain 



This allows processes to spread more effectively to multiple cores
(particularly important on 64-core chips!).

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent df29ccb6

arch/tile/include/asm/topology.h

+57 −18
Original line number Diff line number Diff line
@@ -44,10 +44,44 @@ static inline const struct cpumask *cpumask_of_node(int node) 
/* For now, use numa node -1 for global allocation. */

#define pcibus_to_node(bus)		((void)(bus), -1)



/*

 * TILE architecture has many cores integrated in one processor, so we need

 * setup bigger balance_interval for both CPU/NODE scheduling domains to

 * reduce process scheduling costs.

 */



/* sched_domains SD_CPU_INIT for TILE architecture */

#define SD_CPU_INIT (struct sched_domain) {				\

	.min_interval		= 4,					\

	.max_interval		= 128,					\

	.busy_factor		= 64,					\

	.imbalance_pct		= 125,					\

	.cache_nice_tries	= 1,					\

	.busy_idx		= 2,					\

	.idle_idx		= 1,					\

	.newidle_idx		= 0,					\

	.wake_idx		= 0,					\

	.forkexec_idx		= 0,					\

									\

	.flags			= 1*SD_LOAD_BALANCE			\

				| 1*SD_BALANCE_NEWIDLE			\

				| 1*SD_BALANCE_EXEC			\

				| 1*SD_BALANCE_FORK			\

				| 0*SD_BALANCE_WAKE			\

				| 0*SD_WAKE_AFFINE			\

				| 0*SD_PREFER_LOCAL			\

				| 0*SD_SHARE_CPUPOWER			\

				| 0*SD_SHARE_PKG_RESOURCES		\

				| 0*SD_SERIALIZE			\

				,					\

	.last_balance		= jiffies,				\

	.balance_interval	= 32,					\

}



/* sched_domains SD_NODE_INIT for TILE architecture */

#define SD_NODE_INIT (struct sched_domain) {				\

	.min_interval		= 8,			\

	.max_interval		= 32,			\

	.min_interval		= 16,					\

	.max_interval		= 512,					\

	.busy_factor		= 32,					\

	.imbalance_pct		= 125,					\

	.cache_nice_tries	= 1,					\
@@ -55,14 +89,19 @@ static inline const struct cpumask *cpumask_of_node(int node) 
	.idle_idx		= 1,					\

	.newidle_idx		= 2,					\

	.wake_idx		= 1,					\

	.flags			= SD_LOAD_BALANCE	\

				| SD_BALANCE_NEWIDLE	\

				| SD_BALANCE_EXEC	\

				| SD_BALANCE_FORK	\

				| SD_WAKE_AFFINE	\

				| SD_SERIALIZE,		\

	.flags			= 1*SD_LOAD_BALANCE			\

				| 1*SD_BALANCE_NEWIDLE			\

				| 1*SD_BALANCE_EXEC			\

				| 1*SD_BALANCE_FORK			\

				| 0*SD_BALANCE_WAKE			\

				| 0*SD_WAKE_AFFINE			\

				| 0*SD_PREFER_LOCAL			\

				| 0*SD_SHARE_CPUPOWER			\

				| 0*SD_SHARE_PKG_RESOURCES		\

				| 1*SD_SERIALIZE			\

				,					\

	.last_balance		= jiffies,				\

	.balance_interval	= 1,			\

	.balance_interval	= 128,					\

}



/* By definition, we create nodes based on online memory. */